Shadowbox



FIG. 1 is a perspective view of my design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is left side view thereof, the left and right sides being symmetric;

FIG. 4 is a back elevational view thereof; and,

FIG. 5 is a top view thereof, the bottom view being planar and unadorned. 

The ornamental design for a shadowbox, as shown and described. 